1. During the phase change from solid to liquid, the temperature of the sample a) increases - PowerPoint PPT Presentation

1. During the phase change from solid to liquid, the temperature of the sample a) increases b) decreases c) doubles d) halves e) does not change. a) increases. 2. The process of melting the solid sample is an ________________ process. a) endothermic b) exothermic

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13. A chunk of iron ( potassium with c = 0.75 J/CFe = 0.46 J/g˚C) at 90˚C is added to a calorimeter containing 150 g of water at 23˚C. The final temperature of the system is 31˚C. What was the mass of the iron?

a) 189.1 g

b) 1.005 g

c) 166.5 g

d) 124.0 g

13. A chunk of iron ( potassium with c = 0.75 J/CFe = 0.46 J/g˚C) at 90˚C is added to a calorimeter containing 150 g of water at 23˚C. The final temperature of the system is 31˚C. What was the mass of the iron?